JPS62180095A - Manufacture of die for producing expendable pattern for casting - Google Patents

Abstract

PURPOSE:To simply and inexpensively obtain the finest dies by electroforming a metal by an electroforming method, electroless plating method or electroforming method and electroless plating method on the surface of a pattern transferred from a reversal mold of a casting to be produced. CONSTITUTION:A master pattern 11 which is a reference for the casting is disposed on a molding board 12 and the four sides of the pattern 11 are enclosed by a flask 13. A molding material 14 is poured into the flask 14 to form a female mold 15. The molding material 14' is poured into the inside enclosed by the flask 13' by the same method as for manufacturing the female mold to form a male mold 17 mounted with electrodes 16, 16'. A conductive paint is coated on the surface of the mold 17 to conduct the electrodes 16, 16' by which a film 18 is formed. The electroforming mold for an upper die 19 is manufactured thereon by utilizing the electroforming method or electroless plating method or the electroforming method and electroless plating method. The said mold is removed from the male mold 17. The electroforming mold for a lower die 20 is similarly manufactured. Raw material packing ports 3, parting pins 4, 4', steam supply ports 5, 5', etc., are mounted to the upper and lower dies 19, 20 which are mounted to frames 1, 2. The assembly is fixed to the conventional die device 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the electroforming method, electroless method, or 11L method on the surface of the upper and lower models, which are obtained by transferring upper and lower molds for producing a 2-hour fugitive model from the current model. The upper and lower molds are manufactured by casting metal onto the surface of the nuclear model using a casting method and an electroless method. This invention relates to a mold manufacturing method for producing a fugitive casting model that enables the production of a mold with a uniform thickness and high thermal conductivity at a low cost.0 [Prior Technology] In order to manufacture a fugitive model, after fixing the upper and lower molds (31 x 32) which are separately cut while being surrounded by upper and lower frames (1) and (2) in a rectangular shape as shown in Figure 6. , the upper and lower frames (1) (2) are equipped with a raw material filling device (3), mold release pins (4 x 4), steam supply ports (5) (5
'), drain outlet (6M6), cooling water piping (7M7
It is common to use the equipment ff1 (8) which has been used in wars such as ), etc., and the shape of the evanescent model is formed by the upper mold (31) and the lower mold (32). Both molds (3
The shape of the fugitive model (8) is determined by the combined shape of , heat resistance and corrosion resistance are essential, and machining is required to accommodate the raw material filling device (3), etc., so currently this mold material is made of aluminum, aluminum alloy, copper alloy, etc. Gold PAf is used, and the manufacturing method is by carving it from raw material, sillage, or forged material.

[Problem that the invention seeks to solve]

゛However, in the fugitive model (9) formed by the upper and lower molds (31) (32), the surface of the part in contact with the mold is transferred as the surface of the fugitive model (9). In turn, this directly affects the surface roughness and dimensional accuracy of the final product, which is a blunt product. Therefore, the accuracy of the dimensional roughness of the mold surface and the high degree of finish phase variation of the # surface are required, so mold manufacturing is required. At the same time, the machining process requires a large amount of time and the cost of manufacturing the mold is high.

Furthermore, a general mold device as shown in FIG.
1) (32) is heated and cooled with steam and water to form a fugitive model (9), so in order to efficiently heat and cool the mold repeatedly, the thickness of the mold must be adjusted. However, this increases the amount of machining and finishing required for the back surface of the mold, contributing to the high cost of mold production.

[Means for solving problems]

The present invention has been created in view of the current situation, and has been developed to reduce the manufacturing cost of molds, which conventionally require enormous manufacturing costs and skilled techniques, and to make manufacturing easier and more efficient. Electroforming or non-electroforming is applied to the surfaces of the upper and lower models that have been individually transferred.
'M method is used to electroform a metal with high thermal conductivity and low coefficient of linear expansion on the surface of the model, so the surface shape of the current model has a good finish and can be manufactured simply and inexpensively. be. In addition, molds are susceptible to corrosion because they are constantly exposed to steam or water during heating and cooling, but in order to correct this, the molds are plated with chrome, nickel, etc. [Function] The present invention aims to solve these problems with a mold made of metal. [Function] The present invention is a method of applying metal to the surface of a model transferred from an existing mold using an electroforming method or an electroless method. When electroforming into
From the physical properties of substances shown in Table 1, 1! The materials used in the casting method are copper and nickel.

It is relatively easy to use materials such as chrome, and in the non-It solution method, copper, nickel, etc. have high thermal conductivity and low coefficient of linear expansion, so it is possible to efficiently form a fugitive model when heating and cooling the mold. and heated at the same time.

Dimensional precision is achieved due to the low expansion and contraction of the mold during cooling.
This results in a mold with high W.

Furthermore, if pure copper is selected as having high thermal conductivity and low linear expansion coefficient, a mold with good properties can be obtained, but on the other hand, it has low corrosion resistance, so in order to correct kneading,
If both the front and back sides of the mold are plated with a highly corrosion-resistant metal, the best mold ever available can be obtained simply and at low cost.

[Actual travel example]

To explain one embodiment of the present invention, a current mold (11), which serves as a reference for the casting to be obtained, is placed on a constant # (12), and the four circumferences of the current mold (11) are surrounded by a frame (13). A female mold (15) is formed by injecting a casting material (14) such as resin 9 stone into the frame (13), and then the obtained female mold (15)
In the same way as the female mold was made, a male mold (17) equipped with an electrode (16 x 16') was formed by injecting resin, plaster, or other casting material (14) into the inside surrounded by the frame (13). Then, electrodes (16X16') were placed on the surface of the male mold (17).
) conductive paint '! A conductive 1T film (18) is formed by i-coating or silver mirror reaction, and then an upper mold ( 19) Electroforming mold? @! ! Remove it from the male mold (17), and remove it from the lower mold (20) in the same way.
) was manufactured and the upper and lower molds (19) (20
) is the raw material filling port (3).

The mold release bin (4X4'), steam supply port (5X5'), etc., and attachment to the frame (1) and (2) are machined to create a conventional mold device P! (8).

Furthermore, if the metal material of the electroforming molds of the upper and lower molds (19) and (20) has high thermal conductivity and low linear expansion coefficient, but low corrosion resistance, then both the front and back surfaces are made of highly corrosion-resistant Nitsukel,
It is also possible to produce a two-layer metal mold plated with metal such as chrome.

〔Effect of the invention〕

The present invention has a diagonal structure, and an electric current v'! The electroforming molds for the upper and lower molds (19) and (20) are manufactured by the electrolytic method, electrolytic method, electrolytic method, and electroless method, but the metal material to be electroformed on the surface of the male mold (17) is Among the physical properties of the substances shown in Table 1, metals such as copper and nickel, which have high thermal conductivity and low coefficient of linear expansion, may be selected and used as appropriate. For example, if an electroforming mold is made of pure copper, good properties can be obtained. However, since pure copper has low corrosion resistance, plating both the front and back sides with a highly corrosion-resistant metal such as nickel or chrome increases the corrosion resistance of the entire mold and heats it.

This effectively prevents pτ corrosion during cooling.

The present invention does not require the complicated process of cutting a complex-shaped mold to a constant thickness from a block-like mold material, as in the past, and the mold is placed on the surface of a model (male mold (17)) transferred from the current mold. Since all kinds of materials suitable for the material are electroformed, it is possible to easily produce molds with irregular shapes such as Nyoyo.
The thickness of gold applied by tJQ makes it easy to manufacture a mold with a uniform thickness, and by plating with a highly corrosion-resistant metal, it is possible to provide an extremely useful mold at a low price, which was not possible before.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a mold manufactured by this method fixed to a conventional mold device, Figs. 2 to 5 are process diagrams of mold manufacturing, and Fig. 2 is a female mold. Vertical cross-sectional view during production, No. 3
Figure 4 is a vertical cross-sectional view during the production of the male mold, Figure 4 is a vertical cross-sectional view during electroforming, Figure 5 is a vertical cross-sectional view of the upper mold with the male removed, and Figure 6 is a vertical cross-sectional view of the upper mold with the male mold removed.
The figure is a longitudinal sectional view of a conventional mold device. In the figure, (1) (2)... Upper and lower frames (3)...
・Raw material filling device (4X4')...Release bin (5X5
)...Steam supply port (6X6')...Drain outlet (7M7...Cooling water piping (8)...Mold installation fl'? (9)...Disappearance model (11) )...Current model (12)...Surface plate (13X13')...Frame (
14X14”l...Casting material (15)...Female mold (1
6X16')...1! Pole (17)...male type (
18)...Membrane (19)...Latch! (20)・
...Lower mold (31X32)...Conventional upper and lower mold patent applicant Taiyo Foundry Co., Ltd. 11°C Figure 5 Figure 6 Procedural amendment (voluntary) March i2, 1985 Mr. Michibe Uga, Commissioner of the Patent Office r゛1, Indication of the case 1986 Patent Application No. 227612, Name of the invention Cast Mold manufacturing method 3 for manufacturing fugitive models for use, relationship with the amended case Patent applicant address 2-5-41 Nishinomiyahara, Yodoyo-ku, Osaka Name Hiko Watanabe, representative of Taiyo Casting Co., Ltd. ± 1 1,,” 1 4. Date of amendment order: 5, Number of inventions not increased by amendment 6, Claims column 7 of the specification subject to amendment, Contents of amendment as stated in the attached sheet . Claim (1) - In manufacturing the upper and lower molds for manufacturing a disappearing model, the surface of the model transferred from the inverted mold of the casting to be manufactured is cast using the T-casting method, electroless method, or IL! A mold manufacturing method for manufacturing a fugitive casting model, characterized by electroforming metal onto the surface by a casting method and an electroless method. (211) is applied to the production of upper and lower molds for producing a fugitive model, and the surface of the model transferred from the inverted mold of the casting to be produced is applied to the surface of the model using the electric control method, electroless method, or electric control method. A mold manufacturing method for producing a fugitive casting model, characterized in that the surface is electroformed with a highly thermally conductive metal using an electrolytic method, and then both the front and back surfaces are plated with a highly corrosion-resistant metal.

Claims (2)

[Claims] (1) When manufacturing the upper and lower molds for manufacturing fugitive casting models, the surface of the model of the cast product to be manufactured is formed by electroforming, electroless method, or electroforming and electroless method. A mold manufacturing method for manufacturing a fugitive casting model, characterized by electroforming metal. (2) When manufacturing upper and lower molds for producing fugitive casting models, the surface of the model of the cast product to be manufactured is coated by electroforming, electroless methods, or both electroforming and electroless methods. A mold manufacturing method for manufacturing a fugitive model for casting, characterized in that after electroforming with a highly thermally conductive metal, the front and back surfaces are further plated with a highly corrosion-resistant metal.